Presid'll know who everybody is, and you can tell from whom they're sitting wient Reagan has been nominated for the 1985 Nobel Peace Prize, the Norwegian daily Verdens Gang reported yesterday. Because of a mail cargo mixup between Stockholm and Oslo, Reagan's nomination was received by Jacob Sverdrup, standing secretary of the Norwegian Nobel Committee, just four hours before the deadline, the paper said. . .

Howard Weitzman, now Cathy Evelyn Smith's defense attorney, said he might advise her to seek a jury trial on murder and drug charges in connection with the death of comedian John Belushi. Smith was freed on bail yesterday after a judge gave Weitzman a Feb. 11 deadline to decide whether she will accept a bargained plea. . .

Barber Conable, the ranking Republican on the House Ways and Means Committee who retired last year, will write a periodic column for U.S. News & World Report. His first, scheduled for the Feb. 11 issue, will tackle the budget process. He joins another contributing columnist, David Gergen, former White House chief of communications under President Reagan. Gergen started his column Jan. 14. . .

John Z. DeLorean and Cristina Ferrare, in the midst of a divorce, have agreed to each hold temporary custody of one of their two children, DeLorean's lawyer said yesterday. Under the agreement, 13-year-old Zachary, DeLorean's adopted child by a former marriage, will live with his father, while 6-year-old Kathryn will live with her mother, Ferrare. . .

Sarah Caldwell, founder and artistic director of the Opera Company of Boston, was in fair condition and out of intensive care yesterday, having recuperated from double pneumonia. . .

American composers will be sought to create six works that will premiere in 1987 on the Constitution's 200th anniversary, Philadelphia Orchestra conductor Riccardo Muti said yesterday. Muti accepted a $90,000 check from Johnson & Higgins, an insurance brokerage firm, to pay the composers' commissions. . .

The Director's Guild of America announced its nominees yesterday for achievement in film direction in 1984: Milos Forman, nominated for "Amadeus"; David Lean for "A Passage to India"; Roland Joffe' for "The Killing Fields"; Norman Jewison for "A Soldier's Story"; and Robert Benton for "Places in the Heart." The award, which will be presented March 9, often signals the outcome of the Academy Awards. . .